This is an older post of mine that highlights a number of memory books: My Recent Reviews [Memory Books]
Since then, I’ve read a number of others, but the highlight has to be Lynne Kelly’s Memory Craft. Highly recommended.
I also have to recommend Dominic O’Brien’s audiotape “Quantum Memory Power.” (I believe this is also available as a book…although it might just be a workbook meant to accompany the audiobook.)